CN113024378A - Acrylic recovery method - Google Patents
Acrylic recovery method Download PDFInfo
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- CN113024378A CN113024378A CN202110277731.0A CN202110277731A CN113024378A CN 113024378 A CN113024378 A CN 113024378A CN 202110277731 A CN202110277731 A CN 202110277731A CN 113024378 A CN113024378 A CN 113024378A
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- mma
- finished product
- acrylic
- waste
- water
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000011084 recovery Methods 0.000 title description 14
- 239000002699 waste material Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000004140 cleaning Methods 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 238000005336 cracking Methods 0.000 claims abstract description 21
- 238000002844 melting Methods 0.000 claims abstract description 21
- 230000008018 melting Effects 0.000 claims abstract description 21
- 238000009833 condensation Methods 0.000 claims abstract description 14
- 230000005494 condensation Effects 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000004064 recycling Methods 0.000 claims abstract description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 7
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000004821 distillation Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 235000010288 sodium nitrite Nutrition 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims 3
- 239000012267 brine Substances 0.000 claims 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims 2
- 239000000463 material Substances 0.000 claims 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 115
- 239000000047 product Substances 0.000 description 39
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000178 monomer Substances 0.000 description 5
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 4
- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- MWFMGBPGAXYFAR-UHFFFAOYSA-N 2-hydroxy-2-methylpropanenitrile Chemical compound CC(C)(O)C#N MWFMGBPGAXYFAR-UHFFFAOYSA-N 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000004702 methyl esters Chemical class 0.000 description 1
- 231100001224 moderate toxicity Toxicity 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000005336 safety glass Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
- C07C67/333—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisation; by change of size of the carbon skeleton
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
- C07C67/54—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method for recycling acrylic, which comprises the following steps of 1), collecting acrylic waste, and selecting waste with the size of no more than 800mm multiplied by 600mm multiplied by 30mm to obtain screened acrylic waste; 2) feeding the screened acrylic waste into a crusher to be crushed to obtain crushed acrylic waste; 3) sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor; 4) condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA; 5) introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA; 6) introducing the cleaned MMA into an azeotropic tower to obtain a mixture of the finished product MMA and water; 7) rectifying the mixture of the obtained finished product MMA and water, recovering the finished product MMA through condensation, and storing the finished product MMA into a storage tank.
Description
Technical Field
The invention relates to the field of acrylic, in particular to a method for recovering acrylic.
Background
Acrylic, commonly known as plexiglass, is a polymer of Methyl Methacrylate (MMA), the chemical name polymethyl methacrylate. Is a resource recycling project which is mainly supported by the country in recent years.
Acrylic acid can be recycled and cracked to regenerate Methyl Methacrylate (MMA) monomer, which is an important raw material for synthetic resin, paint, coating, adhesive industry and medical polymer materials. Acrylic (organic glass) has good transparency, waterproofness, corrosion resistance and aging resistance, and can be used as safety glass, lighting equipment, optical instruments, handicraft products and the like. Meanwhile, the MMA monomer is also an important raw material for synthesizing fine chemicals such as water treatment flocculant, fabric dyeing and finishing agent, oil additive, plastic resin modifier and the like. The most traditional Acetone Cyanohydrin (ACH) method is adopted for producing MMA in China, the process technology is lagged behind and seriously polluted, the ACH serving as a raw material is seriously deficient in recent years, the production capacity of MMA in China cannot meet the demand far away, and a large amount of MMA is imported from abroad every year. Therefore, MMA has a wide market prospect in China.
In the prior art, the comprehensive yield of the refined MMA is lower, the yield of byproducts is high, and the production of three wastes is large.
Disclosure of Invention
In view of the problems existing in the prior art, the present invention aims to solve at least one of the above problems:
in a first aspect: the provided acrylic acid recovery method comprises the following steps:
1) collecting acrylic waste, and selecting waste with the size of no more than 800mm multiplied by 600mm multiplied by 30mm to obtain screened acrylic waste; 2) feeding the screened acrylic waste into a crusher to be crushed to obtain crushed acrylic waste; 3) sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor; 4) condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA; 5) introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA; 6) introducing the cleaned MMA into an azeotropic tower to obtain a mixture of the finished product MMA and water; 7) rectifying the mixture of the obtained finished product MMA and water, recovering the finished product MMA through condensation, and storing the finished product MMA in a storage tank.
Preferably, the method selects waste material no greater than 500mm x 20 mm.
Preferably, the amount of acrylic waste to be input is calculated, and then the screened acrylic waste is sent to a grinder to be ground according to the calculated amount to obtain the ground acrylic waste.
Preferably, the furnace is a completely closed furnace.
Preferably, crude MMA vapor is subjected to secondary water-cooling condensation treatment, and the condensed crude product is subjected to normal pressure state to obtain crude MMA.
Preferably, the cleaning tank is a saline cleaning tank, and the liquid in the saline cleaning tank contains sodium chloride and sodium nitrite.
Preferably, the cleaned MMA is introduced into an azeotropic tower, the temperature in the tower is 80-90 ℃, the atmospheric pressure is realized, MMA and an azeotrope are obtained, the obtained azeotrope is condensed and then enters an auxiliary tower, and the azeotrope is subjected to reduced pressure distillation in the auxiliary tower, so that a mixture of water and finished MMA is obtained.
Preferably, water and a finished product MMA mixture are separated by an oil-water separator to obtain water and the finished product MMA, the MMA enters a finished product tank, a low-boiling-point substance of the azeotropic tower enters a main tower, the main tower is subjected to reduced pressure rectification, and the distillate MMA is condensed to obtain a finished product MMA which is introduced into a storage tank.
MMA: methyl methacrylate of the formula C5H8O2The chemical formula weight is 100.12, and the compound is an organic compound, also called MMA, and is abbreviated as methyl ester. Is an important chemical raw material, and is a monomer for producing transparent plastic polymethyl methacrylate (polymethyl methacrylate, PMMA). Flammable, strong pungent odor, moderate toxicity, and should be avoided for long-term contact.
Has the advantages that:
according to the method, the waste materials with proper sizes are screened out and crushed, then the MMA gas is obtained through melting and cracking, and then the finished product MMA is obtained through cleaning and condensing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for recycling acrylic acid according to an embodiment of the present invention,
fig. 2 is a schematic flow chart of another acrylic acid recovery method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a recycling method for acrylic acid, which is suitable for recycling acrylic acid.
Step 101: collecting acrylic waste, and selecting waste with the size of no more than 800mm multiplied by 600mm multiplied by 30mm to obtain screened acrylic waste;
step 102: sending the screened acrylic waste into a crusher for crushing to obtain crushed acrylic waste;
step 103: sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor;
step 104: condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA;
step 105: introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA;
step 106: introducing the cleaned MMA into an azeotropic tower to obtain a mixture of the finished MMA and water;
step 107: rectifying the mixture of the obtained finished product MMA and water, recovering the finished product MMA through condensation, and storing the finished product MMA in a storage tank.
In the process, the acrylic waste is firstly classified in step 101, and then the waste with the size not larger than 800mm multiplied by 600mm multiplied by 30mm is selected for the next step, so that the subsequent treatment is more convenient. Crushing the waste in step 102, because the crushing process is better performed after the screening in step 101, then sending acrylic waste into a melting cracking furnace in step 103 to obtain MMA vapor mainly to be treated and recovered, then recovering crude MMA through condensation in step 104, then cleaning MMA to remove impurities in step 105, then passing through an azeotropic tower in step 106 to obtain a mixture of finished MMA and water, finally rectifying the mixture of MMA and water, recovering finished MMA through condensation, storing the finished MMA in a storage tank, recovering acrylic through the process to improve the comprehensive yield of MMA, reducing the output of byproducts and reducing the output of three wastes.
Referring to fig. 2, fig. 2 is a schematic flow chart of another acrylic acid recycling method, which is suitable for recycling acrylic acid.
Step 201: collecting acrylic waste, and selecting waste with the size of no more than 500mm multiplied by 20mm to obtain screened acrylic waste;
step 202: sending the screened acrylic waste into a crusher for crushing to obtain crushed acrylic waste;
step 203: sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor;
step 204: condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA;
step 205: introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA;
step 206: introducing the washed MMA into an azeotropic tower, condensing the obtained azeotrope, then introducing the condensed azeotrope into an auxiliary tower, and carrying out reduced pressure distillation on the azeotrope in the auxiliary tower to obtain a mixture of water and finished MMA;
step 207: separating water and a finished product MMA (methyl methacrylate) mixture by an oil-water separator, feeding the MMA into a finished product tank, feeding a low-boiling-point substance of an azeotropic tower into a main tower, carrying out reduced pressure rectification on the main tower, condensing the MMA of a distillate to obtain a finished product MMA, and feeding the MMA into a storage tank.
In step 201, the waste material not greater than 500mm × 500mm × 20mm is selected, and compared with the flow chart 1, a part of acrylic waste material is screened out, the subsequent recovery efficiency is accelerated, in step 206, the azeotrope is subjected to recondensation and recovery, the recovery rate of MMA is further improved, in step 207, MMA with high purity is obtained through an oil-water separator, reduced pressure rectification and condensation, the MMA is stored, the environmental protection is ensured, the output of byproducts is reduced, the output of three wastes is reduced, and meanwhile, the recovery rate is further improved and the purity of MMA is improved.
Example 1
The acrylic acid recovery method comprises the following steps:
1) collecting acrylic waste, and selecting waste with the weight of not more than 800mm multiplied by 600mm multiplied by 30mm, wherein the total weight is 10kg, so as to obtain screened acrylic waste;
2) feeding the screened acrylic waste into a crusher to be crushed to obtain crushed acrylic waste;
3) sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor;
4) condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA;
5) introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA;
6) introducing the cleaned MMA into an azeotropic tower to obtain a mixture of the finished product MMA and water;
7) rectifying the mixture of the obtained finished product MMA and water, recovering the finished product MMA through condensation, and storing the finished product MMA in a storage tank.
Example 2
The acrylic acid recovery method comprises the following steps:
1) collecting acrylic waste, and selecting waste with the weight of 10kg and the weight of no more than 500mm multiplied by 20mm to obtain screened acrylic waste;
2) feeding the screened acrylic waste into a crusher to be crushed to obtain crushed acrylic waste;
3) sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor;
4) condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA;
5) introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA;
6) introducing the cleaned MMA into an azeotropic tower to obtain a mixture of the finished product MMA and water;
7) rectifying the mixture of the obtained finished product MMA and water, recovering the finished product MMA through condensation, and storing the finished product MMA in a storage tank.
Example 3
The acrylic acid recovery method comprises the following steps:
1) collecting acrylic waste, and selecting waste with the weight of not more than 800mm multiplied by 600mm multiplied by 30mm, wherein the total weight is 10kg, so as to obtain screened acrylic waste;
2) feeding the screened acrylic waste into a crusher to be crushed to obtain crushed acrylic waste;
3) sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor;
4) condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA;
5) introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA, wherein the cleaning tank is a saline water cleaning tank, and the liquid in the saline water cleaning tank contains sodium chloride and sodium nitrite;
6) introducing the cleaned MMA into an azeotropic tower, condensing the obtained azeotrope and then introducing the condensed azeotrope into an auxiliary tower, and distilling the azeotrope under reduced pressure in the auxiliary tower to obtain a mixture of water and the finished MMA;
7) rectifying the mixture of the obtained finished product MMA and water, recovering the finished product MMA through condensation, and storing the finished product MMA in a storage tank.
Example 4
The acrylic acid recovery method comprises the following steps:
1) collecting acrylic waste, and selecting waste with the weight of not more than 800mm multiplied by 600mm multiplied by 30mm, wherein the total weight is 10kg, so as to obtain screened acrylic waste;
2) feeding the screened acrylic waste into a crusher to be crushed to obtain crushed acrylic waste;
3) sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor;
4) condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA;
5) introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA;
6) introducing the cleaned MMA into an azeotropic tower to obtain a mixture of the finished product MMA and water;
7) separating water and a finished product MMA by a mixture of the water and the finished product MMA through an oil-water separator, feeding the MMA into a finished product tank, feeding a low-boiling-point substance of the azeotropic tower into a main tower, performing reduced pressure rectification on the main tower, condensing the distillate MMA to obtain a finished product MMA, and introducing the finished product MMA into a storage tank.
Comparative example 1
Comparative example 1 differs from example 1 only in that the scrap in step 1) is greater than 800mm x 600mm x 30mm, the other methods and conditions being in accordance with example 1.
Comparative example 2
Comparative example 2 differs from example 1 only in that step 4) is eliminated and the other methods and conditions are identical to those of example 1.
Comparative example 3
Comparative example 3 differs from example 1 only in that step 5) is eliminated, and the other methods and conditions are the same as those of example 1.
Comparison of MMA-derived products obtained in examples 1 to 4 and comparative examples 1 to 3 is shown in Table 1 below (with respect to the volume of the rectifying tank of 20m3)，
TABLE 1
| Monomer purity (%) | Fraction (m) of rectification3) | Color of acrylic finished product | |
| Example 1 | 95 | 18.5 | White colour (Bai) |
| Example 2 | 94 | 18.3 | White colour (Bai) |
| Example 3 | 96 | 18.2 | White colour (Bai) |
| Example 4 | 94 | 18.4 | White colour (Bai) |
| Comparative example 1 | 75 | 13.5 | Yellow colour |
| Comparative example 2 | 69 | 14.2 | Yellow colour |
| Comparative example 3 | 72 | 15.1 | Yellow colour |
As can be seen from Table 1, the single MMA product obtained by the method has high purity, the purity is more than 94%, the rectification fraction is high and more than 18.2, the color standard of the obtained acrylic product is white, and the comparison between comparative examples 1-3 and the example 1 shows that the size of acrylic waste, the condensation recovery step and the step of cleaning through a cleaning tank have great influence on the purity of the obtained monomer, the rectification fraction and the color of the acrylic product, the size of the waste is less than 800mm multiplied by 600mm multiplied by 30mm, the condensation recovery step and the step of cleaning through the cleaning tank ensure that the single MMA product obtained has high purity, the rectification fraction and white color.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for recycling acrylic acid, which is characterized by comprising the following steps:
1) collecting acrylic waste, and selecting waste with the size of no more than 800mm multiplied by 600mm multiplied by 30mm to obtain screened acrylic waste;
2) feeding the screened acrylic waste into a crusher to be crushed to obtain crushed acrylic waste;
3) sending the crushed acrylic waste into a melting cracking furnace to obtain crude MMA vapor;
4) condensing and recovering crude MMA vapor obtained through melting and cracking to obtain crude MMA;
5) introducing the obtained crude MMA into a cleaning tank for cleaning to obtain cleaned MMA;
6) introducing the cleaned MMA into an azeotropic tower to obtain a mixture of the finished product MMA and water;
7) rectifying the mixture of the obtained finished product MMA and water, recovering the finished product MMA through condensation, and storing the finished product MMA in a storage tank.
2. The method as set forth in claim 1 further defined as step 1), wherein the method selects scrap material no greater than 500mm x 20 mm.
3. The method as claimed in claim 1, wherein the step 2) is specifically that the amount of acrylic waste to be input is calculated, and then the screened acrylic waste is sent to a pulverizer according to the calculated amount to be pulverized, so as to obtain the pulverized acrylic waste.
4. The method according to claim 1, wherein step 3) is in particular a completely closed melting and cracking furnace.
5. The method as claimed in claim 1, wherein the step 4) is specifically that crude MMA vapor is subjected to secondary water-cooling condensation treatment, and the condensed crude MMA is obtained under normal pressure.
6. The method according to claim 1, wherein the step 5) is specifically that the washing tank is a brine washing tank, and the liquid in the brine washing tank contains sodium chloride and sodium nitrite.
7. The method as claimed in claim 1, wherein the step 6) is specifically that the cleaned MMA is introduced into an azeotropic tower, the temperature in the tower is 80-90 ℃, the atmospheric pressure is adopted to obtain MMA and azeotrope, the obtained azeotrope is condensed and then enters a secondary tower, and the azeotrope is subjected to reduced pressure distillation in the secondary tower to obtain a mixture of water and finished product MMA.
8. The method as claimed in claim 7, wherein the step 7) is specifically that the mixture of water and finished product MMA is separated into water and finished product MMA by an oil-water separator, the MMA enters a finished product tank, the low-boiling-point substance of the azeotropic tower enters a main tower, the main tower is subjected to reduced pressure rectification, and the distillate MMA is condensed to obtain a finished product MMA which is introduced into a storage tank.
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|---|---|---|---|
| CN202110277731.0A CN113024378A (en) | 2021-03-15 | 2021-03-15 | Acrylic recovery method |
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| CN202110277731.0A CN113024378A (en) | 2021-03-15 | 2021-03-15 | Acrylic recovery method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10025945A1 (en) * | 2000-05-26 | 2001-12-06 | Roehm Gmbh | Process of derivatives of methacrylic acid polymerizable for the purification of monomers obtainable by cracking organic high polymer monomers |
| CN1560021A (en) * | 2004-03-11 | 2005-01-05 | 廖活强 | Process of preparaing methyl acrylate by waste organic glass and apparatus thereof |
| CN109293985A (en) * | 2018-09-10 | 2019-02-01 | 夏美佳 | A kind of waste and old organic glass cracking recovery process |
| CN109761814A (en) * | 2018-12-19 | 2019-05-17 | 霍振辉 | A kind of method that continuous cracking acrylic prepares MMA monomer |
| CN111662175A (en) * | 2020-06-04 | 2020-09-15 | 麻城市中优顺建材科技有限公司 | Method and system for preparing MMA (methyl methacrylate) monomer by recycling waste acrylic |
-
2021
- 2021-03-15 CN CN202110277731.0A patent/CN113024378A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10025945A1 (en) * | 2000-05-26 | 2001-12-06 | Roehm Gmbh | Process of derivatives of methacrylic acid polymerizable for the purification of monomers obtainable by cracking organic high polymer monomers |
| CN1560021A (en) * | 2004-03-11 | 2005-01-05 | 廖活强 | Process of preparaing methyl acrylate by waste organic glass and apparatus thereof |
| CN109293985A (en) * | 2018-09-10 | 2019-02-01 | 夏美佳 | A kind of waste and old organic glass cracking recovery process |
| CN109761814A (en) * | 2018-12-19 | 2019-05-17 | 霍振辉 | A kind of method that continuous cracking acrylic prepares MMA monomer |
| CN111662175A (en) * | 2020-06-04 | 2020-09-15 | 麻城市中优顺建材科技有限公司 | Method and system for preparing MMA (methyl methacrylate) monomer by recycling waste acrylic |
Non-Patent Citations (1)
| Title |
|---|
| 王俊香: "废旧有机玻璃裂解制备甲基丙烯酸甲酯及其应用研究" * |
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